A rod of brass la held in hand and rubbed with fur. The rod is found to have

A. no charge

B. positive charge

C. negative charge

D. can't be said

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  1. The cell that can be recharged, after it has run down, by passing a direct current through it from a…
  2. When temperature decreases, resistance of metals to flow of electricity
  3. The transistor was invented by
  4. Heat is transmitted from one end of a metal rod to its other end by the method of
  5. The image formed by a plane mirror is
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  17. Of the following which has got the highest frequency?
  18. Cosmic rays are
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  20. The speed at which light travels in vacuum is
  21. The acoustical quality of a room depends on
  22. X-rays were discovered by
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  24. The device for tracking and locating the position of a moving object in space is called
  25. In a river, the currents are fastest where the river la
  26. Mercury does not stick to glass because
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  28. The orbit of Venus lies between those of
  29. At what temperature do the Fahrenheit and Kelvin scales give the same reading?
  30. Rays similar to X-rays but of smaller wave length that are given off by radioactive substances are